Influence of gas density on the stability of homogeneous flow in bubble columns

Hoefsloot, Hubertus C. J. ; Krishna, Rajamani (1993) Influence of gas density on the stability of homogeneous flow in bubble columns Industrial & Engineering Chemistry Research, 32 (4). pp. 747-750. ISSN 0888-5885

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Official URL: http://pubs.acs.org/doi/abs/10.1021/ie00016a024

Related URL: http://dx.doi.org/10.1021/ie00016a024

Abstract

Stability analysis is used to show that an important parameter determining the stability of homogeneous bubbly flows in a bubble column is the Richardson-Zaki exponent n in the bubble swarm velocity relationship Uswarm = ν (l-ε)n. Analysis of bubble swarm velocity shows that with increasing gas density the value of this exponent decreases; physically this means that increasing gas density results in reduced interaction between neighboring bubbles and, consequently, reduced chance of propagation of instabilities. This provides a rationalization of the experimental observation that the influence of increased gas density, ρG, is to delay the transition from homogeneous bubbly flow to churn-turbulent flow.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:94170
Deposited On:27 Aug 2012 11:03
Last Modified:27 Aug 2012 11:03

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